| Records |
| Author |
Picard, N.; Mortier, F.; Rossi, V.; Gourlet-Fleury, S. |
| Title |
Clustering species using a model of population dynamics and aggregation theory |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ecological Modelling |
Abbreviated Journal |
Ecol. Model. |
| Volume |
221 |
Issue |
2 |
Pages  |
152-160 |
| Keywords |
Aggregation theory; Species grouping; Species richness; Tropical rainforest; Usher model |
| Abstract |
The high species diversity of some ecosystems like tropical rainforests goes in pair with the scarcity of data for most species. This hinders the development of models that require enough data for fitting. The solution commonly adopted by modellers consists in grouping species to form more sizeable data sets. Classical methods for grouping species such as hierarchical cluster analysis do not take account of the variability of the species characteristics used for clustering. In this study a clustering method based on aggregation theory is presented. It takes account of the variability of species characteristics by searching for the grouping that minimizes the quadratic error (square bias plus variance) of some model's prediction. This method allows one to check whether the gain in variance brought by data pooling compensate for the bias that it introduces. This method was applied to a data set on 94 tree species in a tropical rainforest in French Guiana, using a Usher matrix model to predict species dynamics. An optimal trade-off between bias and variance was found when grouping species. Grouping species appeared to decrease the quadratic error, except when the number of groups was very small. This clustering method yielded species groups similar to those of the hierarchical cluster analysis using Ward's method when variance was small, that is when the number of groups was small. (C) 2009 Elsevier B.V. All rights reserved. |
| Address |
[Picard, Nicolas; Mortier, Frederic; Rossi, Vivien; Gourlet-Fleury, Sylvie] CIRAD, F-34398 Montpellier 5, France, Email: nicolas.picard@cirad.fr |
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ELSEVIER SCIENCE BV |
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0304-3800 |
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| Notes |
ISI:000273628800004 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
85 |
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| Author |
Bertani, S.; Houel, E.; Stien, D.; Chevolot, L.; Jullian, V.; Garavito, G.; Bourdy, G.; Deharo, E. |
| Title |
Simalikalactone D is responsible for the antimalarial properties of an amazonian traditional remedy made with Quassia amara L. (Simaroubaceae) |
Type |
Journal Article |
| Year |
2006 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
J. Ethnopharmacol. |
| Volume |
108 |
Issue |
1 |
Pages |
155-157 |
| Keywords |
antimalarial; Quassia amara; quassinoids; simalikalactone D; traditional medicine |
| Abstract |
French Guiana (North-East Amazonia) records high malaria incidence rates. The traditional antimalarial remedy most widespread there is a simple tea made out from Quassia amara L. leaves (Simaroubaceae). This herbal tea displays an excellent antimalarial activity both in vitro and in vivo. A known quassinoid, simalikalactone D (SkD), was identified as the active compound, with an IC50 value of 10 nM against FeB1 Plasmodium falciparum chloroquine resistant strain in vitro. Lastly, it inhibits 50% of Plasmodium yoelii yoelii rodent malaria parasite at 3.7 mg/kg/day in vivo by oral route. These findings confirm the traditional use of this herbal tea. (c) 2006 Elsevier Ireland Ltd. All rights reserved. |
| Address |
Univ Toulouse 3, UMR 152, Ctr IRD, F-97323 Cayenne, French Guiana, Email: deharo@cayenne.ird.fr |
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| Publisher |
ELSEVIER IRELAND LTD |
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| ISSN |
0378-8741 |
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| Notes |
ISI:000241573000023 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
173 |
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| Author |
Stahl, C.; Burban, B.; Wagner, F.; Goret, J.-Y.; Bompy, F.; Bonal, D. |
| Title |
Influence of Seasonal Variations in Soil Water Availability on Gas Exchange of Tropical Canopy Trees |
Type |
Journal Article |
| Year |
2013 |
Publication |
Biotropica |
Abbreviated Journal |
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| Volume |
45 |
Issue |
2 |
Pages |
155-164 |
| Keywords |
French Guiana; Photosynthesis; Predawn leaf water potential; Rain forest; Relative extractable water; Respiration; Soil drought; Transpiration |
| Abstract |
Seasonal variations in environmental conditions influence the functioning of the whole ecosystem of tropical rain forests, but as yet little is known about how such variations directly influence the leaf gas exchange and transpiration of individual canopy tree species. We examined the influence of seasonal variations in relative extractable water in the upper soil layers on predawn leaf water potential, saturated net photosynthesis, leaf dark respiration, stomatal conductance, and tree transpiration of 13 tropical rain forest canopy trees (eight species) over 2 yr in French Guiana. The canopies were accessed by climbing ropes attached to the trees and to a tower. Our results indicate that a small proportion of the studied trees were unaffected by soil water depletion during seasonal dry periods, probably thanks to efficient deep root systems. The trees showing decreased tree water status (i.e., predawn leaf water potential) displayed a wide range of leaf gas exchange responses. Some trees strongly regulated photosynthesis and transpiration when relative extractable water decreased drastically. In contrast, other trees showed little variation, thus indicating good adaptation to soil drought conditions. These results have important applications to modeling approaches: indeed, precise evaluation and grouping of these response patterns are required before any tree-based functional models can efficiently describe the response of tropical rain forest ecosystems to future changes in environmental conditions. © 2012 by The Association for Tropical Biology and Conservation. |
| Address |
INRA, UMR 1137 Université de Lorraine, INRA Nancy 'Ecologie et Ecophysiologie Forestière', Champenoux 54280, France |
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| Notes |
Export Date: 13 March 2013; Source: Scopus |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
474 |
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| Author |
Marchal, R.; Mothe, F.; Denaud, L.E.; Thibaut, B.; Bleron, L. |
| Title |
Cutting forces in wood machining – Basics and applications in industrial processes. A review COST Action E35 2004-2008: Wood machining – micromechanics and fracture |
Type |
Journal Article |
| Year |
2009 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
| Volume |
63 |
Issue |
2 |
Pages |
157-167 |
| Keywords |
cutting forces; online control; peeling process; physico-mechanical model; sound; vibrations; wood industry; wood machining |
| Abstract |
The data available in the literature concerning wood cutting forces permits to build models or to simulate the main wood machining processes ( milling, sawing, peeling, etc.). This approach contributes to a better understanding of formation of wood surfaces and chips and the data may be helpful to optimise cutting geometry, reduce tool wear, improve tool material, and to size tool-machines. The models may also be useful for industrial application in two ways: ( 1) providing data to optimise the settings for a given operation ( batch approach), and ( 2) building predictive models that could be the basis of an online control system for the machining processes ( interactive approach). A prerequisite for this is that numerous machining tests on different wood materials are performed based on experiences with different kind of tools and experimental devices. With a focus on potential industrial applications, the emphasis of this review was on the wood peeling process, which is a very demanding special case of wood cutting. Although not so many industrial machines are equipped with expensive force sensors, there is a lot of high quality information available about cutting forces which may be useful to improve the scientific or technological knowledge in wood machining. Alternative parameters, such as vibration or sound measurements, appear to be promising substitutes in the praxis, particularly to feed online control systems of any wood cutting process. |
| Address |
[Marchal, Remy; Bleron, Laurent] Arts & Metiers ParisTech, LABOMAP, F-71250 Cluny, France, Email: remy.marchal@cluny.ensam.fr |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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| Notes |
ISI:000263932200006 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
205 |
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| Author |
Anouhe, J.-B.S.; Adima, A.A.; Niamké, F.B.; Stien, D.; Amian, B.K.; Blandinieres, P.-A.; Virieux, D.; Pirat, J.-L.; Kati-Coulibaly, S.; Amusant, N. |
| Title |
Dicorynamine and harmalan-N-oxide, two new β-carboline alkaloids from Dicorynia guianensis Amsh heartwood |
Type |
Journal Article |
| Year |
2015 |
Publication |
Phytochemistry Letters |
Abbreviated Journal |
Phytochemistry Letters |
| Volume |
12 |
Issue |
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Pages |
158-163 |
| Keywords |
ABTS antioxidant; Biogenesis; Dicorynia guianensis; Nitrone; Spiroindolone |
| Abstract |
Abstract The chemical investigations of Dicorynia guianensis heartwood led to the isolation of four new indole alkaloids for the first time in this plant. Compound (1) identified as spiroindolone 2′,3′,4′,9′-tetrahydrospiro [indoline-3,1′pyrido[3,4-b]-indol]-2-one, and compound (3) described as nitrone 1-methyl-4,9-dihydro-3H-pyrido [3,4-b] indole 2-oxide and were isolated for the first time as natural products. ABTS antioxidant activity guided their isolation. © 2015 Published by Elsevier B.V. on behalf of Phytochemical Society of Europe. |
| Address |
CIRAD, Département Environnements et Sociétés, UMR Ecologie des Forêts de GuyaneKourou cedex, France |
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Export Date: 24 April 2015 |
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no |
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EcoFoG @ webmaster @ |
Serial |
598 |
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| Author |
Barriault, I.; Barabe, D.; Cloutier, L.; Gibernau, M. |
| Title |
Pollination ecology and reproductive success in Jack-in-the-pulpit (Arisaema triphyllum) in Quebec (Canada) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol. |
| Volume |
12 |
Issue |
1 |
Pages |
161-171 |
| Keywords |
Araceae; bisexual inflorescence; deceptive pollination; Mycetophilidae; pollen load; Thysanoptera; visitation rates |
| Abstract |
Pollination ecology and reproductive success of Jack-in-the-pulpit (Arisaema triphyllum) were studied in two natural populations in Quebec, Canada. Individual A. triphyllum plants can be of three types: male, female or bisexual. In both populations studied, the presence of bisexual inflorescences was not negligible (13%), where 'female' and 'male' bisexual plants were categorised according to the relative number of stamens and ovaries. 'Male bisexual' plants produce only pollen and 'female bisexual' plants produce only fruit. Hence, A. triphyllum is a true dioecious plant, as each plant only reproduces through either the male or the female function. 'Female bisexual' plants were equivalent to female plants in terms of visitation rate by insects, fructification rate and production of berries and seeds. Neither agamospermy in female plants nor self-pollination in 'female bisexual' plants was found, thus A. triphyllum relies on insects for cross-pollination. Despite the long flowering cycle, a low visitation rate was documented: only 20-40% of inflorescences were visited, according to gender, by a mean of 1.5 insects. In this study, Mycetophilidae represented the most generically diversified and abundant family, as well as the most efficient insect pollinator, especially the genera Docosia and Mycetophila. |
| Address |
[Gibernau, M.] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR, CNRS, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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1435-8603 |
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| Notes |
ISI:000272589700017 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
89 |
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| Author |
Duval, R.; Duplais, C. |
| Title |
Fluorescent natural products as probes and tracers in biology |
Type |
Journal Article |
| Year |
2017 |
Publication |
Natural Product Reports |
Abbreviated Journal |
Natural Product Reports |
| Volume |
34 |
Issue |
2 |
Pages |
161-193 |
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| Abstract |
Covering: 1985 up to the end of 2016 Fluorescence is a remarkable property of many natural products in addition to their medicinal and biological values. Herein, we provide a review on these peculiar secondary metabolites to stimulate prospecting of them as original fluorescent tracers, endowed with unique photophysical properties and with applications in most fields of biology. The compounds are spectrally categorized (i.e. fluorescing from violet to the near infra-red) and further structurally classified within each category. Natural products selected for their high impact in modern fluorescence-based biological studies are highlighted throughout the article. Finally, we discuss aspects of chemical ecology where fluorescent natural products might have key evolutionary roles and thus open new research directions in the field. © 2017 The Royal Society of Chemistry. |
| Address |
CNRS, UMR 8172 EcoFoG (Ecologie des Forêts de Guyane), AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 23 avenue Pasteur, Cayenne, France |
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Export Date: 23 February 2017 |
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no |
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EcoFoG @ webmaster @ |
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736 |
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Dejean, A.; Rodríguez-Pérez, H.; Carpenter, J.M.; Azémar, F.; Corbara, B. |
| Title |
The predatory behavior of the Neotropical social wasp Polybia rejecta |
Type |
Journal Article |
| Year |
2017 |
Publication |
Behavioural Processes |
Abbreviated Journal |
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| Volume |
140 |
Issue |
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Pages |
161-168 |
| Keywords |
Epiponine wasps; Polistinae; Predation; Prey selection; Recruitment; Vespidae |
| Abstract |
Abstract We experimentally studied the predatory behavior of Polybia rejecta (Vespidae, Polistinae, Epiponini) towards 2–88 mm-long insects attracted to a UV light trap. Foragers, which began to hunt at 6:30, selected 4–14 mm-long prey insects. Prey detection by sight by hovering wasps was confirmed using decoys. After the wasps landed and walked along a sinuous path, prey were detected by contact or from a distance (1–3 cm). This was followed by seizure, stinging (contrarily to most other known cases), prey manipulation and retrieval. Prey that flew off might be caught in flight. The prey load, representing 30.7% of a forager’s weight, was optimized by capturing up to six small prey or two medium-sized prey successively (both of which might be consumed in situ). The foragers cut off the wings of larger prey or cut them into two pieces and returned to gather the second piece. The handling time increased exponentially with the weight of the prey. Partial loading (i.e., retrieving a load much inferior to the maximum possible) was likely related to social facilitation, a form of nest-based recruitment that was demonstrated through the experimental elimination of local enhancement by removing foragers (both mechanisms favor the exploitation of favorable patches). |
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0376-6357 |
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no |
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EcoFoG @ webmaster @ |
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751 |
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Cachet, N.; Ho-A-Kwie, F.; Rivaud, M.; Houel, E.; Deharo, E.; Bourdy, G.; Jullian, V. |
| Title |
Picrasin K, a new quassinoid from Quassia amara L. (Simaroubaceae) |
Type |
Journal Article |
| Year |
2012 |
Publication |
Phytochemistry Letters |
Abbreviated Journal |
Phytochem. Lett. |
| Volume |
5 |
Issue |
1 |
Pages |
162-164 |
| Keywords |
Malaria; P. falciparum; Quassia amara; Quassinoids; Simaroubaceae |
| Abstract |
A new quassinoid Picrasin K 1 was isolated from a decoction made of Quassia amara leaves, traditionally used in French Guyana to treat malaria. The structure and relative stereochemistry of 1 was determined through extensive NMR analysis. Picrasin K showed a low activity against Plasmodium falciparum in vitro (IC 50 = 8 μM), and a similar low activity on human cancerous cells line (IC 50 = 7 μM on MCF-7 cells line). © 2011 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved. |
| Address |
CNRS, UMR Ecofog, Université des Antilles et de la Guyane, Cayenne, France |
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18743900 (Issn) |
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Export Date: 8 March 2012; Source: Scopus; doi: 10.1016/j.phytol.2011.12.001; Language of Original Document: English; Correspondence Address: Jullian, V.; UMR-152 Pharma-Dev, IRD, Université Paul Sabatier Toulouse 3, 31062 Toulouse, France; email: jullian@cict.fr |
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no |
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EcoFoG @ webmaster @ |
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382 |
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Salas-Lopez, A.; Violle, C.; Mallia, L.; Orivel, J. |
| Title |
Land-use change effects on the taxonomic and morphological trait composition of ant communities in French Guiana |
Type |
Journal Article |
| Year |
2018 |
Publication |
Insect Conservation and Diversity |
Abbreviated Journal |
Insect Conserv Divers |
| Volume |
11 |
Issue |
2 |
Pages |
162-173 |
| Keywords |
Community assembly; Formicidae; functional diversity; gradient analysis; habitat filtering; land-use intensification; n-dimensional hypervolume approach |
| Abstract |
Abstract Land-use changes frequently lead to major changes in the composition and diversity of organisms. A reduction in the range of strategies enabling organisms to survive in a given environment and changes in the average trait values of species may potentially be associated with variations in species? number and identity. We investigated the variation in ant taxonomic composition and morphological trait diversity along a land-use gradient in French Guiana. We measured 13 core ant morphological traits on all species sampled. We then selected the set of five traits that best captured changes along the land-use gradient. Potential effects of the variation in morphological trait diversity and average values were evaluated by examining morphological traits individually as well as in combination. We found that variation in taxonomic diversity was unrelated to the plot-level morphospace. Conversely, a significant shift in taxonomic composition was accompanied by changes in the average values of community traits along the studied gradient, examined both individually and in combination. We argue that morphological trait values may be related to the success of different species in surviving in a given environment and, therefore, are indicative of the taxonomic turnover in ants along the land-use gradient. Nevertheless, in contradiction with theoretical expectations, the morphospace is only slightly affected by habitat filtering and loosely impacted by taxonomic changes. Examining the sensitivity of the morphospace to abiotic and biotic factors and how it reflects varying ecological pressures for species is thus of the utmost importance. |
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John Wiley & Sons, Ltd (10.1111) |
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1752-458x |
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doi: 10.1111/icad.12248 |
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EcoFoG @ webmaster @ |
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892 |
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